The man was discovered with an injury to his abdomen at around 4am on Coote Street, which is the street on which the man lived.

He was taken to Midland Regional Hospital but was later transferred to St. Vincent's Hospital in Dublin.

A garda spokesperson said the man is in a critical condition.

"The scene is preserved and a technical examination will be carried out in the area," a garda spokesperson said.

Gardai wish to speak to anyone with information or anyone who was in the Coote Street area between 3.30am and 4.30am, is asked to contact Portlaoise Garda Station 057 - 8674100, the Garda Confidential Line 1800 666111 or any Garda Station.